US3856915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent recycle process for recovery of rhenium from molybdate solutions
Assignee: GTE Sylvania Inc
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Filing: 1972-05-19
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Granted: 1974-12-24
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Expires: 1992-05-19
Abstract
Abstract Recovery of rhenium from molybdate solutions in substantially theoretical yields can be achieved by sampling the extractant solution after stripping rhenium and adding sufficient active extractant to attain substantially the same rhenium extraction and separation efficiency that is achieved with a comparable extractant solution prior to initial contact with molybdaterhenium solutions.
Inventors
- 👤 L Pagnozzi
- 👤 T Kim
- 👤 J Laferty
- 👤 M Macinnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:12
CPC Classifications
C; C22; C22B; C22B61/00; C01; C01G; C01G47/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
IN A PROCESS FOR THE RECOVERTY OF RHENIUM FROM AQUEOUS MOLYBDATE SOLUTIONS WHEREIN AN ORGANIC EXTRACTION SOLUTION IS USED TO SELECTIVELY EXTRACT RHENIUM FROM SAID MOLYBDATE SOLUTION AND IS THEREAFTER STRIPPED WITH A RHENIUM STRIPPING AGENT TO REMOVE RHENIUM FROM THE ORGANIC, THE IMPROVEMENT COMPRISING: A. ESTABLISHING AN INITIAL RHENIUM EXTRACTION EFFECIENTLY OF AN ORGANIC EXTRACTION SOLUTION COMPRISING A QUATERNARY AMINE AS THE ACTIVE EXTRACTANT, A PRIMARY ALCOHOL AS A SOLUBILIZER AND AN ALIPHATIC SOLVENT, B. MEASURING THE RHENIUM EXTRACTION EFFECIENCY OF SAID ORGANIC EXTRACTION SOLUTION AFTER CONTACT WITH SAID MOLYBDATE SOLUTION AND SUBSEQUENT CONTACT WITH SAID RHENIUM STRIPPING AGENT, C. ADDING SUFFICIENT ORGANIC ACTIVE EXTRACTANT TO SAID ORGANIC EXTRACTION SOLUTION TO ATTAIN SUBSTANTIALLY THE INTIAL RHENIUM EXTRACTION EFFICIENCY, AND D. RECYCLING SAID ORGANIC AFTER SAID ADDITION TO CONTACT SAID MOLYBDATE SOLUTIONS.
Claim 2
Dependent Claim
132 words
IN A PROCESS FOR THE RECOVERTY OF RHENIUM FROM AQUEOUS MOLYBDATE SOLUTIONS WHEREIN AN ORGANIC EXTRACTION SOLUTION IS USED TO SELECTIVELY EXTRACT RHENIUM FROM SAID MOLYBDATE SOLUTION AND IS THEREAFTER STRIPPED WITH A RHENIUM STRIPPING AGENT TO REMOVE RHENIUM FROM THE ORGANIC, THE IMPROVEMENT COMPRISING: A. ESTABLISHING AN INITIAL RHENIUM EXTRACTION EFFECIENTLY OF AN ORGANIC EXTRACTION SOLUTION COMPRISING A QUATERNARY AMINE AS THE ACTIVE EXTRACTANT, A PRIMARY ALCOHOL AS A SOLUBILIZER AND AN ALIPHATIC SOLVENT, B. MEASURING THE RHENIUM EXTRACTION EFFECIENCY OF SAID ORGANIC EXTRACTION SOLUTION AFTER CONTACT WITH SAID MOLYBDATE SOLUTION AND SUBSEQUENT CONTACT WITH SAID RHENIUM STRIPPING AGENT, C. ADDING SUFFICIENT ORGANIC ACTIVE EXTRACTANT TO SAID ORGANIC EXTRACTION SOLUTION TO ATTAIN SUBSTANTIALLY THE INTIAL RHENIUM EXTRACTION EFFICIENCY, AND D. RECYCLING SAID ORGANIC AFTER SAID ADDITION TO CONTACT SAID MOLYBDATE SOLUTIONS.
Claim 3
Dependent Claim
24 words
An improvement according to claim 1 wherein said stripping agent is selected from the group consisting of nitric acid, perchloric acid and ammonium thiocyanate.
Claim 4
Dependent Claim
20 words
An improvement according to claim 2 wherein said quaternary amine is tricaprylyl monomethyl amine and said primary alcohol is decylalcohol.
Claim 5
Dependent Claim
13 words
An improvement according to claim 3 wherein said stripping agent is nitric acid.
Claim 6
Dependent Claim
13 words
A process according to claim 1 wherein said process is a continuous process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |